I Samuel 15:11: Verse 11
It repenteth me that I have set up Saul - That is, I placed him on the throne; I intended, if he had been obedient, to have established his kingdom. He has been disobedient; I change my purpose, and the kingdom shall not be established in his family. This is what is meant by God's repenting - changing a purpose according to conditions already laid down or mentally determined.